its wireless feature surprised and worries me. I mean, yes, it is convenient to have a wireless headphone, but from the past products, wireless headphone usually does not perform that well. (from the thread.. seems like the DWL5000
will be power by two AA batteries.

According to the review (I can read Japanese) these sound on par with the ATH-AD1000 despite being completely wireless. According to Audio Technica, the priority throughout development was solely on delivering the best sound quality.

The full set with the headphones and wireless transmitter thingy looks to be about $1000 US though (it said about 120,000 yen retail), which is quite a bit more than what AD1000s cost, but still, looks like it's shaping up to be the ultimate in wireless head-fi.

I'm not really sure, I don't understand all that techy-talk. Here are some bites that I could understand:

-It works with AAC, Dolby Digital, Dolby Pro Logic II and DTS.
-Transmits a 24-bit digital signal.
-The inputs are for fiber optic digital, analog, 5.1 analog.
-You can buy a set of the headphones alone for roughly $350-$400 US, which can then be used wirelessly off the same transmitter (for people who want multiple cans for simultaneous use). When using multiple sets, the transmitter outputs a 16-bit digital signal instead of usual 24-bit.
-The cans with batteries loaded weighs 375g.